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- Title
超宽带低损耗SAW滤波器的优化设计.
- Authors
黄歆; 闫坤坤; 黄玮; 魏勇平
- Abstract
This paper describes the development of ultra-wideband and very low-loss SAW filter based on the large electromechanical coupling coefficient Love wave mode, a Cu electrode/15〇YX-LiNbO3 structure was employed as a substrate. The design adopts the modified coupled mode model for accurate simulation and simulated annealing algorithm for the optimization ofresonator parameters. The width/length weighted dummy electrodes were used to suppressspuriousresponsescaused by the transverse-mode resonances,and a viscous iilm was coated on the iilter surface which is effective in suppress a spurious dip caused by Rayleigh mode. A iilter with the center frequency of 620 MHz, — 1 dB fractional bandwidth of 14. 9% , 一3 dB bandwidth of 18. 3% , insertion loss of 0. 94 dB, and ou-- of-band rejection of higher than 40 dB was fabricated.
- Subjects
INSERTION loss (Telecommunication); PROCESS optimization; BANDWIDTHS; SURFACE coatings; SAWING; SIMULATED annealing
- Publication
Piezoelectrics & Acoustooptics, 2020, Vol 42, Issue 2, p155
- ISSN
1004-2474
- Publication type
Article
- DOI
10.11977/j.issn.1004-2474.2020.02.002